Added extra info to form helper docs for set_value() #1878

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@smith153

Added the following to form helper docs for set_value():

.. note:: In order for the POST data to be available to this function, the form variable
must first be validated with the Form Validation Class. If this is not done, the
default value will always be returned.

@cryode

There's a note about this on the bottom of the page already. I disagree with the redundancy, but I think the bottom of the page is not the best place for this note, given how often people are confused by this.

@smith153

Yes, I actually noticed the other note after I added mine.

@smith153 smith153 closed this Oct 13, 2012
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